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Three-phase alternating-current chopper

A three-phase AC, wave converter technology, applied in the direction of converting AC power input to AC power output, output power conversion devices, electrical components, etc., to prevent damage, avoid peak voltage, and improve reliability.

Active Publication Date: 2012-03-14
CHANGZHOU TIANMAN INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this method is only suitable for medium and small power resistive loads in the field of AC voltage regulation

Method used

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  • Three-phase alternating-current chopper
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  • Three-phase alternating-current chopper

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Embodiment Construction

[0038] The AC chopper device and its switch control method of the present invention will be described in detail below with reference to the accompanying drawings. First of all, it must be stated that although the present invention is described with the following examples, the present invention cannot be limitedly interpreted with the present examples, and the present invention can be implemented within the scope of the claims except for the following special instructions.

[0039] Figure 5 It is a specific embodiment of the present invention. The circuit includes the following parts: an input filter circuit, a semiconductor switch circuit, an output filter circuit, a voltage polarity detector, and a switch control logic circuit. Wherein, the input filter circuit and the output filter circuit are used to filter the voltage or current ripple generated by the AC chopper during operation. The semiconductor switching circuit is composed of a fully controlled switching device IGB...

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Abstract

The invention relates to a three-phase alternating-current chopper which is connected between a three-phase alternating current voltage source and a load and can provide a voltage the phase of which is the same to the input voltage phase and amplitude of which is changed to the load. The three-phase alternating-current chopper comprises an input filter circuit, a semiconductor switch circuit, an output filter circuit, a voltage polarity detector and a switch control logic circuit, wherein the input end of the voltage polarity detector is connected with the three-phase alternating-current power supply and is used for detecting the polarity of the line voltage of the three-phase alternating-current power supply and sending a detected line voltage polarity signal to the switch control logic circuit; and the switch control logic unit controls the switching of semiconductor switch circuit states according to the voltage polarity signal sent by the voltage polarity detector. When the copper is converted between an active mode and a follow current mode by using the switch control method, the current is in a loop in a loaded line, so that damage of the semiconductor switch is not generated for no peak voltages are generated on the load and line inducer due to an overlarge current change rate.

Description

1. Technical field [0001] The invention relates to a three-phase AC chopper device, in particular to a converter for adjusting the amplitude of an input AC voltage and outputting it by means of a switch. 2. Technical Background [0002] As a relatively mature AC voltage regulation technology, phase-controlled rectification technology has replaced electromagnetic voltage regulation technology in many occasions and has been widely used. However, the phase-controlled rectification technology has many insurmountable defects, such as low power factor affected by the firing angle, slow dynamic response, rich output low-order harmonics, and serious grid harmonic current pollution. In recent years, the AC chopper based on the simple topology of the DC chopper has become a new research hotspot. The AC chopper control voltage regulation technology has the advantages of only depending on the power factor of the load, fast dynamic response, wide linear voltage regulation range, easy fi...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M1/32
Inventor 曼苏乐
Owner CHANGZHOU TIANMAN INTELLIGENT TECH
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